Air Changes Per Hour

Air Changes per Hour

Determining the number of Air Changes Per Hour is crucial when choosing which model and how many units you will need for your air purification needs. The following data has been gathered from various sources. We continually look to ASHRE , the EPA, and Engineering websites for newly updated clean air information. The lists below shows engineering recommendations for the number of air changes needed  in specific buildings and rooms. Your needs may vary. We also include a table on required air changes per occupant. Using these charts you should be able to determine how much air purification you need. 

Air changes can be done by bringing in fresh outdoor air or by indoor air purification.  Remember these are only recommendations.  If you need more help planning the Indoor Air Quality for your business or home, please give the experts at LakeAir a call @ 800-558-9436.

  

 

Building / Room

Recommended Air Changes Per Hour

All spaces in general

min 4

Assembly halls

4 – 6

Attic spaces for cooling

12 – 15

Auditoriums

8 – 15

Bakeries

20 – 30

Banks

4 – 10

Barber Shops

6 – 10

Bars

20 – 30

Beauty Shops

6 – 10

Boiler rooms

15 – 20

Bowling Alleys

10 – 15

Cafeterias

12 – 15

Churches

8 – 15

Classrooms

6 – 20

Club rooms

12

Clubhouses

20 – 30

Cocktail Lounges

20 – 30

Computer Rooms

15 – 20

Court Houses

4 – 10

Dance halls

6 – 9

Dental Centers

8 – 12

Department Stores

6 – 10

Dining Halls

12 -15

Dining rooms (restaurants)

12

Dress Shops

6 – 10

Drug Shops

6 – 10

Engine rooms

4 – 6

Factory buildings, ordinary

2 – 4

Factory buildings, with fumes or moisture

10 – 15

Fire Stations

4 – 10

Foundries

15 – 20

Galvanizing plants

20 – 30

Garages repair

20 – 30

Garages storage

4 – 6

Homes, night cooling

10 – 18

Hospital rooms

4 – 6

Jewelry shops

6 – 10

Kitchens

15 – 60

Laundries

10 – 15

Libraries, public

4

Lunch Rooms

12 -15

Luncheonettes

12 -15

Nightclubs

20 – 30

Machine shops

6 – 12

Malls

6 – 10

Medical Centers

8 – 12

Medical Clinics

8 – 12

Medical Offices

8 – 12

Mills, paper

15 – 20

Mills, textile general buildings

4

Mills, textile dye houses

15 – 20

Municipal Buildings

4 – 10

Museums

12 -15

Offices, public

3

Offices, private

4

Photo dark rooms

10 – 15

Pig houses

6 – 10

Police Stations

4 – 10

Post Offices

4 – 10

Poultry houses

6 – 10

Precision Manufacturing

1 0 – 50

Pump rooms

5

Residences

4 – 6

Restaurants

8 – 12

Retail

6 – 10

School Classrooms

4 – 12

Shoe Shops

6 – 10

Shopping Centers

6 – 10

Shops, machine

5

Shops, paint

15 – 20

Shops, woodworking

5

Substation, electric

5 – 10

Supermarkets

4 – 10

Swimming pools

20 – 30

Town Halls

4 – 10

Taverns

20 – 30

Theaters

8 – 15

Transformer rooms

10 – 30

Turbine rooms, electric

5 – 10

Warehouses

6 – 30

Waiting rooms, public

4

 

 

Type of Building and Room 

 OccupantCFM 
  
  

Animals

Sheep

CFM per Animal

6

Horses

CFM per Animal

85

Hens

CFM per Animal

6

Cows

CFM per Animal

212

Chickens

CFM per Animal

4

Pigs, sow

CFM per Animal

127

Piglet

CFM per Animal

32

Apartments

 

CFM per Person

32

Assembly halls

 

CFM per Person

21-32

Auditoriums

 

CFM per Person

21-32

Bakeries

Production

CFM per Person

32-42

Pastry room

CFM per Person

32-42

Banks

Service

CFM per Person

21-32

Archive

CFM per Person

15-21

Staff

CFM per Person

21-32

Baths

 

CFM per Person

32

Barber Shops

 

CFM per Person

21-32

Bars

 

CFM per Person

32-42

Beauty Shops

 

CFM per Person

21-32

Bowling Alleys

 

CFM per Person

21-32

Cafeterias

 

CFM per Person

21-32

Cinemas/Theaters

 

CFM per Person

15-21

Chemist’s shops

Sterile room

CFM per Person

42-53

Laboratory

CFM per Person

42-53

Packing room

CFM per Person

21-32

Store

CFM per Person

15-21

Churches

 

CFM per Person

21

Clubhouses

 

CFM per Person

32-42

Cocktail Lounges

 

CFM per Person

32-42

Computer Rooms

 

CFM per Person

21-32

Court Houses

 

CFM per Person

21-32

Dance halls

 

CFM per Person

32-42

Dental Clinics, Offices

 

CFM per Person

21-32

Department Stores (cfm/Sq.Ft)

 

CFM per Person

21-32

Dining Halls

 

CFM per Person

21-32

Drug Store

 

CFM per Person

21-32

Engine rooms

 

CFM per Person

21-32

Exhibition halls

 

CFM per Person

21-32

Fire Stations

 

CFM per Person

21-32

Garages

 

CFM per Person

21-32

Hospitals

General

CFM per Person

32

Therapy

CFM per Person

21-32

Operating theater

CFM per Person

42-64

Autopsy

CFM per Person

32

Hotels

Reception

CFM per Person

32-42

Room

CFM per Person

21-32

Industries

Factory

CFM per Person

21-42

Carpenter work shop

CFM per Person

21-32

Car repair shop

CFM per Person

21-32

Car repair shop, exhaust outlet

CFM per Car

127-170

Mechanical work shop

CFM per Person

32-42

Welding

CFM per Person

42

Assembly

CFM per Person

21-32

Jails

 

CFM per Person

21-32

Jewelry Shop

 

CFM per Person

21-32

Libraries

 

CFM per Person

21-32

Lunch Rooms, Luncheonettes

 

CFM per Person

21-32

Municipal Buildings

 

CFM per Person

21-32

Museums

 

CFM per Person

21-32

Laundries

 

CFM per Person

32-42

Lavatories

 

CFM per Person

21

Night Clubs

 

CFM per Person

32-52

Malls

 

CFM per Person

21-32

Motels

 

CFM per Person

32-42

Offices

Module

CFM per Person

21-42

Landscape

CFM per Person

21-42

Conference room

CFM per Person

62-64

Lecture room

CFM per Person

21-42

Dining hall

CFM per Person

32-53

Staff, changing clothes

CFM per Person

21-32

Dining room

CFM per Person

32

Resting room

CFM per Person

32

Police Stations

 

CFM per Person

21-32

Post Offices

 

CFM per Person

21-32

Precision Manufacturing

 

CFM per Person

21-32

Restaurants

 

CFM per Person

21-32

Retail Stores (cfm/Sq.Ft)

 

CFM per Person

21-32

Schools

Classroom

CFM per Person

21-32

Shops

 

CFM per Person

21-32

Shopping Centers

 

CFM per Person

21-32

Sports halls

 

CFM per Person

32-42

Supermarkets

 

CFM per Person

21

Swimming pools

 

CFM per Person

32

Taverns

 

CFM per Person

21-32

Town Halls

 

CFM per Person

21-32